Tool-fishing apparatus.



A. c. GRAH M; TODL FISHING APPARATUS. APPLIUATIOH FILED NOV. 11, 1909.

Patented Aug. 16, 1910.

6m gam/m M1150 V nm'auzrs a citizen of the United States, and a resident- ALBERT C. GRAHAM, OE QILF IELDS, CALIFORNIA.

roorrrrsnme APPARATUS.

Specification of Letters Patent Patented Aug. 16, 1910.

Application filed November 11, 1909. Serial No. 527,399.

To all whom concem:

Be it known that I, ALBERT O. GRAHAM,

of Oilfields, in the county of Fresno and State of California, have invented a new and Improved Tool-Fishing Apparatus, of which the following is a full, clear, and exact description. v

The object of the invention is to provide a new and improved tool' fishing apparatus for use in .oil andsimilar wells, and arranged to insure an automatic-release of the gripping jaws by the action of the tools to be fished out. For the purpose mentioned the gripping device on the carrier is held by fragile frangible means in an inactive position, and a releasing means is connected with the gripping device and is adapted to be actuated by the tool to be fishedfor, to release the gripping device.

A practical embodiment of the invention is represented in the accompanying drawings forming, a part of this specification, in which similar characters of reference indicate corresponding parts in both views.

Figure 1 is a side elevation of the tool fishing apparatus, showing the jaws in inactive, non-gripping position within the easing, the latter being shown insection; and Fig. 2 is a transverse section of the same and showing the jaws released and in gripping engagement' with the casing.

\Vhen using the tool fishing apparatus, such, for instance, as disclosed in the Letters Patent'of the United States,'No. 571,279, granted to G. L. McKain, November 10, 1896, it frequently happens that the jaws or gripping slips are not released, and hence the fishing tool engaged with the drilling tools remains in the :well on withdrawing the casing. In the McKain device. referred to, the slips are held in an inactive position by a string, and when the drilling tool is caught then the carrler is drawn upward into the casing and the fishing apparatus is attached, with a view to breakthe string. This operation is frequently ineffective; that is, the string is not broken and the slips are not released, and hence on withdrawing the casing the drilling tool and the fishing apparatus remain in the well andare lost. With my improvement, presently to be described m detail, the jaws are positively-released by the action of the drilling tool on taking hold of the same by'the fishing apparatus, and an exceedingly firm gripping in Figs. 1 and 2.

The jaws C are attached to the ends of the drawings, consistin ofthe casing by the jaws takes place, and hence when the casing is withdrawn the fishing apparatus and the drilling tool are carried along.

The. carrier A of the fishing apparatus is preferably made from a single piece of metal, and is provided on opposite sides I with tapering seats B, on which slide the jaws or slips C, having serrated faces, as plainly indicated in the vdrawings. The jaws C are-normally held in a lowermost D, of wood or other suitable material, inserted in openings in the carrier A directly above the jaws C, at the time the latter are in a lowermost position, as indicated in Fig. 1. Thus when the jaws G are in this lowermost, inactive position the carrier A can be readily let down in the casing E by the usual cable F attached to the UPPer end of the carrier A,it being understood that the said carrierA is lowered beyond the lower end of the tubing G, as indicated a. transverse"pin H held on the upper end of a releasing rod mounted to slide within the carrier A and projecting beyond the lower end thereof, as plainly indicated in the drawings, the pin H extending through an elongated slot A formed in the carrier A, while the releasing rod H extends within a bore A and'slides in a bushing A held in the lower end of the carrier A. A spring I is arranged within the bore A, and rests with its lower end on the bushing A and the upper end of the spring presses against i or inactive position by fragile frangible pins the head H? ofthe rod H, soas to force the jaws C, C upward into gripping engagement-with the casing E after the pins D are brokenzand the jaws arereleased.

The lower end of the carrier A is provided with a suitable fishing tool for enengagement with the drilling tool to be fished for, the said fishing tool, as shown in of a. socket J screwed on the lower en of the carrier A, and containing gripping jaws K, pressed on'by a spring L and adapted to engage the iflpper end of the drilling tool N to be fished or. in the casing E with the jaws C held in inactive position by the pins'D and the drillingtool N passes into the socket/J, it

engages the lower end of therod H and pushes the same upward, and in doing so Now when the carrieriA is lowered the upper ends of the jaws C break or cut off the pins D, whereby the jaws C are released and slide upward by the action of the spring I, whereby the jaws move into firm gripping engagement with the casing I E, as indicated in Fig.2. As soon as this takes place, the cable F is cut and the easing E is withdrawn from the well and with it the carrier A and the tool N held in position by the jaws K in the clutch J attached to the lower end of the carrier A.

From the foregoing it will-be seen that the jaws C are automatically released by the drilling tool N actuating the releasing rodH connected by the cross pin H with I the jaws C. It will also be noticed that by the arrangement described, a comparatively strong spring I may be employed, to force the jaws G into gripping position and to hold the same therein during the withdrawal of the casing E.

Having thus described my invention, I

- claim as new and desire to secure by Letters Patent:

1. A tool fishing a paratus, provided'with a grippingdevice, agile frangible means for normally holding the said gripping device'in an inactive position, and releasing means connec'tedwith the saidgripping device and adapted to be actuated by the tool to be fished for,-to release the said gripping device.

2. A. tool fishing apparatus,provided with spring-pressed vmovable jaws, fragile frangible means fornormally holding the said.

aws in an inactive position, and a releasing rod connected with the said jaws and adapted to be actuated by the tool to be fished for, to cause the jaws to break the fragile .means and thus releasethe jaws.

releasing rod connected with the said jaws on the said seats, a releasing rod within the said carrier and having a cross pin engaging the said jaws, the lower end of the said rod being adapted to be engaged b the tool to be fished-for, and fragile frangi lepins held on the said carrier and engaging the said jaws to normally hold the jaws in an inactive position.

7. A tool fishing apparatus, comprising a carrier having tapering seats, jaws sliding on the said seats, a releasing rod within the said carrier and having a cross pin engaging the said jaws, the lower end of the said r being adapted to be engaged by the tool to be fished for, fragile pins held on the said carrier and engaging'the said jaws to normally hold the jaws in an inactive position,

and a spring within the said carrier and pressing the said releasing rod.

8. A tool fishing apparatus comprising a carrier having inclined seats and jaws for gripping the casing slidable on the seats, a releasing rod connected with the jaws for moving them on the seats, said rod extending below the carrier in position for engagement by the tool and frangible means normally holding thejaws in inoperative position and adapted to be broken when the releasing rod is engaged and moved by the tool. 1

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

' ALBERT C. GRAHAM.

Witnesses:

R. S. FINE, D. HEGGIE. 

